Watch strap



FIG. 1 is a perspective view of a watch strap according to my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a first end view thereof; and,

FIG. 7 is a second end view thereof.

The broken line areas show environmental subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a watch strap, as shown and described. 